US magazine claimed that President Asif Ali Zardari had been feeling increased pressure over the Memogate scandal.

On Tuesday, President Asif Ali Zardari was hospitalised in Dubai for medical checkups, complaining of heart pains.

Citing former US official, American magazine Foreign Policy reported US government were informed that Zardari had a 'minor heart attack' on Monday night and flew to Dubai via air ambulance on Tuesday.

According to the US magazine, Zardari may have angioplasty on Wednesday and may also resign on account of 'ill health.'

Former US government official said that President barrack Obama spoke with Zardari over the weekend regarding Nato's killing of 24 Pakistani soldiers, Zardari was 'incoherent.'

"The noose was getting tighter -- it was only a matter of time," the former official said, expressing the growing expectation inside the U.S. government that Zardari may be on the way out.

US magazine quoted its source that over a dozen of Zardari's ambassadors in foreign countries were in the process of being recalled in what might be a precursor to Zardari stepping down as president.